The development and stability of porosity formed during the pyrolysis of polyborodiphenylsiloxane

Howard M. Williams, Elizabeth A. Dawson, Philip A. Barnes, Brian Rand, Rik M D Brydson

Research output: Contribution to journalArticle

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Abstract

The pyrolysis of polyborodiphenylsiloxane has been studied at temperatures up to 1600 °C under an inert atmosphere. Above 1200 °C both a nano-scale β-SiC and an amorphous phase developed while at temperatures greater than 1400 °C significant mesoporosity started to appear, with surface areas and pore volumes reaching maximum values at around 1500 °C. The porosity decreased at higher pyrolysis temperatures and disappeared completely when the material was subsequently heated in an oxidising atmosphere at temperatures above 400 °C. The mesoporosity seems to be present in carbon rich areas which appeared when SiC started to crystallise. EELS showed that boron was present at all pyrolysis temperatures. Comparisons are made with the pyrolysis of polycarbosilane.

LanguageEnglish
Pages261-267
Number of pages7
JournalMicroporous and Mesoporous Materials
Volume99
Issue number3
DOIs
Publication statusPublished - 10 Feb 2007

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pyrolysis
Pyrolysis
Porosity
porosity
Temperature
polycarbosilanes
temperature
Boron
inert atmosphere
Electron energy loss spectroscopy
boron
Carbon
atmospheres
carbon

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Williams, Howard M. ; Dawson, Elizabeth A. ; Barnes, Philip A. ; Rand, Brian ; Brydson, Rik M D. / The development and stability of porosity formed during the pyrolysis of polyborodiphenylsiloxane. In: Microporous and Mesoporous Materials. 2007 ; Vol. 99, No. 3. pp. 261-267.
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The development and stability of porosity formed during the pyrolysis of polyborodiphenylsiloxane. / Williams, Howard M.; Dawson, Elizabeth A.; Barnes, Philip A.; Rand, Brian; Brydson, Rik M D.

In: Microporous and Mesoporous Materials, Vol. 99, No. 3, 10.02.2007, p. 261-267.

Research output: Contribution to journalArticle

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AU - Williams, Howard M.

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AB - The pyrolysis of polyborodiphenylsiloxane has been studied at temperatures up to 1600 °C under an inert atmosphere. Above 1200 °C both a nano-scale β-SiC and an amorphous phase developed while at temperatures greater than 1400 °C significant mesoporosity started to appear, with surface areas and pore volumes reaching maximum values at around 1500 °C. The porosity decreased at higher pyrolysis temperatures and disappeared completely when the material was subsequently heated in an oxidising atmosphere at temperatures above 400 °C. The mesoporosity seems to be present in carbon rich areas which appeared when SiC started to crystallise. EELS showed that boron was present at all pyrolysis temperatures. Comparisons are made with the pyrolysis of polycarbosilane.

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